May 02, Comments. Concrete poured in hot weather, low humidity, or high wind can suffer adverse effects if proper adjustments are not made to the process. Among other things, this can include using shade to block direct sunlight or spraying aggregates with cold water to keep them cool. Concrete sets by hydrating. In other words, it sucks up water and forms crystals around the particles in the concrete. The cooler the concrete, the longer this process takes and the more time the crystals have to strengthen. When the concrete is hotter, the crystallization process happens more quickly, giving the crystals less time to strengthen. Evaporation also can have a negative effect on the surface layer of the concrete.
Ever been tempted to pour off a little cold brew before it has finished brewing?
Desperate for a caffeine fix, we've done it. The result was an overpoweringly strong brew. Nothing like the smooth, sweet brew we're accustom to. In this post, we'll take a closer look at the various stages of extraction and do a little taste testing while we're at it. You may have noticed that those first initial drips into the carafe are super dark while the last few drips are much lighter in color and more transparent. The rate of extraction is not constant. Looking at the picture above, it doesn't even appear to be a linear process. It looks like the bulk of extraction has taken place during the initial parts of the brew based how dark and opaque the first sample is compared to the next sample. This sort of non-linear extraction is expected.
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I am in the final stages of finessing my new film shot in Iraq and Syria. After a ruthless and exhausting 6 years of war in Syria, only the most ideologically strong militias have managed to flourish, absorbing various fragmented rebel factions and uniting them under strict philosophies. The warring creeds could not be any more different. One seeks a decentralized, secular, grassroots version of democracy, while the other seeks a radical interpretation of an Islamic State. Yet, on both sides, soldiers dream of establishing their own version of Utopia, ideologically shaping the world beneath their feet. For over 8 months, international journalists and photographers have been blocked from entering the regions of Northern Syria controlled by the SDF due to a strict embargo enforced by all surrounding countries. At the time of writing, the SDF are less than 10 kilometers from the outskirts of the city itself. My journey began in Kobane- a city of anomalies. To understand the new battle for Raqqa, we must first understand the significance of what happened here. In July of , the Syrian Arab Army abandoned Kobane and other Kurdish enclaves of Syria to dedicate their dwindling resources to other areas of the country in conflict with both a rebellion and jihadist insurgency.